I agree that it's a problem, although the team showed last year that you can still win when your team commits turnovers, as long as your there on the defensive end not letting the opponenet capitalize on those turnovers.
But although there are many suspect turnovers that the team commits (i.e. traveling, 3 seconds, etc.), there are also several times when the team is just careless with the ball, and commits unforced turnovers. Those are the worst, because you're essentially just gifting the opposition the ball without them doing anything for it.
It would be nice to pick up another veteran for the stretch run and into the playoffs, but if we don't it's not the end of the world. When Doc Rivers was saying during the 19-game winning streak that the team still had things they need to work on and improve, that wasn't just coach-speak. It was true. And if the team improves in these areas, they won't need any help outside of the players that are alraedy on their roster.